Identifying ECU's Options

[Fastbird]

I'm about to pull the trigger on an AEM plug and play EMS for our car. But, I'm unsure of which year the ECU is from. Is there an easy way to tell what year the ECU is from any external markings???? I need to make sure I get the right year AEM box for our swap. Thanks!

[lagos]

look up the part number on it.

[toyotacrazy]

look up the part number on it.

JDM 185 ecu's-
89661-20750=89/10-90/03(superceeded to 20751)
89661-20751=90/03-91/08
89661-2b310=91/08-92/02
89661-2b280=91/08-93/09

[Fastbird]

That's a good start right there, but the only think that concerns me is the overlap of part numbers of various months.

Here's another question: Are the JDM pinouts significantly different from USDM pinouts?

This post has been edited by Fastbird: May 16, 2007 - 11:08 AM

[Gary]

That's a good start right there, but the only think that concerns me is the overlap of part numbers of various months.

Here's another question: Are the JDM pinouts significantly different from USDM pinouts?

It all depends.
What is your ECU number?

[Fastbird]

ECU is 89661-2B280

Now my problem is that AEM makes a PNP for 90-92 and 93-95, and by the third post in this thread, this ECU was in use fron Aug 91 until Sept 93, so what gives?

[brianforster]

my EPC sucks, that ecu isnt even on mine..

your ecu is from a 92 alltrac.

This post has been edited by brianforster: May 16, 2007 - 1:45 PM

[Fastbird]

Yeah, that's straight off of the sticker. Here's a pic:

[Fastbird]

my EPC sucks, that ecu isnt even on mine..

your ecu is from a 92 alltrac.

I was waiting for an update after I posted the pic and didn't notice until now that you had edited your post. Thanks a TON man!!!!!!

[brianforster]

i just google searched your part number and it came up with a post here where tweak was telling someone who had the same part number that it was from a 92 alltrac, cause they did their wiring for a 91

[Fastbird]

i just google searched your part number and it came up with a post here where tweak was telling someone who had the same part number that it was from a 92 alltrac, cause they did their wiring for a 91

Nice. I didn't think of googling a relatively obscure part number like this. Thanks again man, I appreciate it.

[brianforster]

no problem, but you might want to cross reference with someone else, just incase i suck at life

[alltracman78]

Be careful with the AEM listed applications.
I don't know if they still have it this way, but a few years ago they had the 93 listed as different than the 92. Which is incorrect.
You want the newer of the 2 [whatever they breakdown for the years, pick the newer years].

Also, FYI for everyone, if you don't have the P# on your ECU you can pull off the cover and look inside.
90/91 has a single circuit board, 92/93 has 2. [don't worry about production dates, if it's a 92 model it will have the 2 boards, while a 91 will have the 1, regardless of build date.]
It has to do with the improved diagnostics on the later ones.
JDM should follow as well.

As far as JDM vs USDM wiring, they are very similar.
As long as you stay in within the revisions you can swap a JDM ST185 or SW20 ECU into a USDM ST85 with no repinning.
However your AC won't work.
Also there is obviously no EGR.
There are a couple other differences too.
Especially for the SW20 ECU [electric pwr steering for one].
For the record, you CAN'T swap a ST185 ECU directly into a SW20.

[Gary]

The one you need is 30-1121

[Fastbird]

Thanks guys, I was all prepped to get the 1120.